10 results about "Methyl Viologen" patented technology

The invention discloses a lithium ion battery negative electrode material with a photochromic characteristic and a preparation method thereof. The molecular formula of the lithium ion battery negative electrode material with the photochromic characteristic is MVMo9O28. Wherein MV is a methyl viologen cation; according to the lithium ion battery negative electrode material with the photochromic characteristic, electron transfer from oxygen atoms to molybdenum atoms occurs under ultraviolet irradiation, and a two-year super-stable charge separation state is formed along with color change of crystals from colorless to blue; when the lithium ion battery negative electrode material with the photochromic characteristic is used as the lithium ion battery negative electrode material, the specific capacity of the battery can be improved in a colored state compared with an initial state; a new strategy is provided for developing a high-performance lithium ion battery negative electrode material, and the ever-increasing energy storage requirement is expected to be met.

The invention discloses a polyvanadic oxygen cluster with thermochromism and a preparation method and application thereof, the structural formula of the polyvanadic oxygen cluster with thermochromism is MV2 [H2V10O28], MV is methyl viologen; the thermochromic polyvanadic oxygen cluster crystal is in the shape of a yellow long-strip block, after thermochromic treatment, the structural formula of the crystal is kept unchanged, wide-range absorption is generated from visible light of an ultraviolet-visible spectrum to a near-infrared region, and the crystal in a color-changing saturated state is in the shape of a dark green long-strip block; the polyvanadium oxygen cluster with thermochromism prepared by the method is used as a positive electrode material and is applied to a zinc ion battery, and the positive electrode material after thermochromism generates a charge separation state which lasts for one year under an environmental condition and generates wide absorption across a visible light-near infrared region.

An ion removal device based on electrochemical and photoelectrochemical methods, and the application of energy conversion and storage are provided. In the ion removal process based on the electrochemical and photoelectrochemical fluidization battery device, the positive active material in the flow battery is the positive pole of device, the negative active material in the fluid battery is the negative pole of the device, and the salt solution is the electrolyte in the middle stream. The positive and negative active materials include organic materials such as 4-hydroxy-piperidinol oxide, riboflavin sodium phosphate or methyl viologen, which have the advantages of low raw material cost, environmental friendliness, high sustainability, excellent electrochemical performance, high specific capacity and good cycle stability etc. The electrolyte can be separated from the positive and negative active liquid flow materials according to the fixed sequence of self-assembly of fluid battery mold.

This invention discloses a near-infrared photocatalytic coupling method for 2-benzene-1,2,3,4-tetrahydroisoquinoline compounds with nucleophiles. The method uses (MV)Bi₂I₈ type perovskite as a catalyst, wherein the organic portion of the catalyst, MV… 2+ The product is a methyl viologen cation. 2-Benzene-1,2,3,4-tetrahydroisoquinoline compounds are reacted with nucleophiles (dimethyl malonate, nitromethane, ethyl nitrosyl acetate) under light irradiation at room temperature or in air to undergo cross-dehydrogenation coupling reactions to obtain the corresponding product. This invention is simple to operate, operates under mild conditions, and uses readily available catalysts. It successfully achieves cross-dehydrogenation coupling between substrates using only near-infrared light, and yields high product yields.

A preparation method and application of a water-soluble transient supramolecular organic framework material belongs to the technical field related to supramolecular organic framework materials. The present invention designs a methyl viologen derivative molecule as one of the assembly units, which is converted into a methyl viologen free radical and cucurbituril self-assembled under the action of a reducing agent to form a supramolecular organic framework material in water. The formation of the assembly is regulated by the reducing agent. When the reducing agent is completely consumed, the supramolecular organic framework spontaneously disassembles, showing time controllability. The transient supramolecular organic framework designed by the present invention can be used as a nanoreactor in the aqueous phase to achieve efficient and green synthesis of catalytic organic matter in water and spontaneous release of the product.

An object of the present disclosure is, at least, to provide an enzyme that dehydroxylates hydroxyl groups at predetermined positions of urolithins having hydroxyl groups at the predetermined positions, and the object can be solved by an enzyme having the following properties (1) and (2): (1) dehydroxylating a hydroxyl group at the 4-position of urolithins; and (2) in the presence of methyl viologen (MV), being activated by one or more components selected from the group consisting of: reduced nicotinamide adenine dinucleotide (NADH); reduced nicotinamide adenine dinucleotide phosphate (NADPH); flavin adenine dinucleotide (FAD); and flavin adenine mononucleotide (FMN).

This invention belongs to the field of fuel cell technology and discloses a methyl viologen-dopamine polymer enzyme-mimicking catalytic electrode, its preparation method, and its application in glucose fuel cells. The methyl viologen-dopamine polymer enzyme-mimicking catalytic electrode was prepared using a continuous cyclic voltammetry-driven methyl viologen-dopamine redox co-assembly method. The preparation method is simple and allows for easy control of deposition amount and degree of polymerization. The prepared electrode not only exhibits outstanding glucose oxidase-mimicking activity for glucose oxidation but also demonstrates good electrocatalytic activity for oxygen reduction. Glucose fuel cells assembled using methyl viologen-dopamine polymer as both anode and cathode catalysts exhibit high open-circuit voltage and power density. The assembled fuel cells do not require precious metal catalysts or enzyme catalysts, and are characterized by simple operation, environmental friendliness, safety, and high efficiency.

This invention discloses a polymeric flow battery cathode material and its preparation method. The polymeric flow battery cathode material is a TEMPO polymer, which includes the structure shown in Formula I, as well as the structures shown in Formula II and / or Formula III. By using TEMPO polymer as the cathode material and methyl viologen or its derivatives as the anode material, this invention yields a polymeric flow battery with outstanding advantages such as high stability, good safety, flexible configuration, fast response, environmental friendliness, high capacity, and stable charge-discharge performance, providing strong support for the application of large-scale energy storage technology.

The application discloses a method for improving stability of TEMPO-MV organic flow battery, and belongs to the technical field of electrochemical energy storage. The application is aimed at the core problem that protons produced by TEMPO decomposition in the cycle of the battery are migrated to the negative electrode, which causes irreversible degradation of methyl viologen (MV) active material and leads to capacity attenuation, and proposes functional modification of the negative electrode; a metal with low hydrogen evolution overpotential is loaded on the negative electrode porous carbon-based electrode as a catalyst; the modified electrode can preferentially adsorb and catalyze the hydrogen evolution reaction of the protons migrated to the negative electrode, and timely discharge the protons in the form of hydrogen, so as to stabilize the local chemical environment of the negative electrode and cut off the degradation path of the active material induced by the protons; after being modified by the method, the capacity attenuation rate of the battery under the working condition of the strong acid positive electrolyte can be reduced from 0.036% / cycle to zero attenuation, and the decomposition rate of the negative electrode MV can be reduced from 8.8% to 1.9%; the method can significantly improve the cycle life and capacity retention rate of the battery, while maintaining good power performance.

The application discloses an iridium (III) complex with low-voltage phosphorescent switch response and a preparation and application thereof, and belongs to the technical field of organic photoelectric materials. The iridium (III) complex is composed of two ring metal C^N ligands and one N^N ligand with an electrically active viologen derivative unit. The electrically active unit in the N^N ligand of the complex is composed of a methyl viologen bridged benzene ring. By virtue of the reversible redox characteristics of the methyl viologen substituent and the rich excited state properties of the iridium (III) complex, under voltage stimulation, the iridium (III) complex undergoes reversible redox reaction, and the response of the material photoluminescence intensity is realized. The luminescence "switch" of the complex has reversibility, and since the viologen unit is only bridged by a single benzene ring, the oxidation is high, and the electrochemical reduction can be realized at a low voltage (1.5 V). By virtue of the characteristics, a switch type electrically stimulated phosphorescent response device can be prepared, and the electrically stimulated phosphorescent response device can be used for information recording.